Triple chocolate buckwheat cookies

g/5½oz dark chocolate chips

g/4½oz dark chocolate (minimum 70% cocoa solids)

g/4½oz buckwheat flour

g/1oz cocoa powder, sieved

bicarbonate of soda

fine sea salt

g/2¼oz soft unsalted butter

g/4½oz soft dark brown sugar

vanilla paste or extract

large free-range eggs, fridge-cold